If postprandial blood glucose is monitored at 10 mmol/L, the first thing that needs to be considered is what foods were eaten. If high calorie, high sugar, high carbohydrate food is consumed, it is recommended to monitor fasting and postprandial blood glucose after a light diet. If the fasting blood glucose is less than 5.6 mmol/L and the 2-hour postprandial blood glucose is less than 7.8 mmol/L, diabetes can be ruled out. If the fasting blood glucose is more than 7mmol/L and the postprandial blood glucose is more than 11.1mmol/L after a light diet, further refinement of the glucose tolerance test is recommended. If the glucose tolerance test suggests that fasting and postprandial blood glucose is significantly elevated, diabetes can basically be diagnosed, and it is recommended that diabetic diet, blood glucose monitoring, and if necessary, medication or even insulin glucose-lowering treatment can be initiated. When monitoring postprandial blood glucose, it is necessary to consider whether it is caused by diet. If it is not diet-induced, further hospitalization is needed to rule out whether diabetes is combined.